feat: Add initial agenda manager demo pages

Author: remydenton

apps/pattern-lab/src/_patterns/04-pages/70-d8-agenda-manager/-agenda-manager-detail--aflac.twig

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+{% include "@bolt/-agenda-manager-detail.twig" with {
+  pageTitle: "What Aflac is Learning About Consumer Expectations Through Monitoring Tech Disruptions",
+  thumbnailPath: "logos/logo-aflac.png"
+} only %}

apps/pattern-lab/src/_patterns/04-pages/70-d8-agenda-manager/-agenda-manager-detail--alan-keynote.twig

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+{% include "@bolt/-agenda-manager-detail.twig" with {
+  pageTitle: "Alan's keynote",
+  thumbnailPath: "portraits/thumbnail-alan.png"
+} only %}